LONDON -- The race was in London, but the thoughts of many were with another city.

Thousands of runners who took part in the London Marathon on Sunday paid tribute to those killed and injured in the Boston Marathon six days earlier. Participants paused for a moment of silence in the beginning, many wore black ribbons on their chests as a sign of solidarity, and two runners finished carrying a banner that read "For Boston."

The men's race was won by Ethiopian Tsegaye Kebede; the women's champion was Kenyan Priscah Jeptoo.

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Kebede, the 2010 winner, passed Kenya's Emmanuel Mutai with a kilometer to go to win in 2 hours, 6 minutes and 4 seconds. Mutai, the 2011 champion, was about 30 seconds back, and Ayele Abshero of Ethiopia finished third. The men were on a record pace for the first half of the race before slowing.

Jeptoo, the Olympic silver medalist, left behind world champion and fellow Kenyan Edna Kiplagat with six miles left and finished on her own in 2 hours, 20 minutes, 15 seconds. Japan's Yukiko Akaba was in third place.

The mood was festive, defiant -- and the surging crowds who turned out on the glorious spring day to line the route roared enthusiastically.

"It means that runners are stronger than bombers," said Valerie Bloomfield, a 40-year-old participant from France.

London's is the first major international marathon since two bombs exploded near the finish line in Boston. The blasts killed three people and wounded 180, and a policeman died during the search for the bombers. One suspect died in a shootout with police, while a second was caught.

Some 35,000 runners took part in the London race, which also drew tens of thousands of spectators -- many regulars said it was the biggest and most enthusiastic crowd in years. Many said they made a point of turning up to show they were not afraid.

"We can't look back. We must look forward," said Tomasz Hamerlak of Poland, who finished fourth in the men's wheelchair race and who had competed in Boston last week. "The show must go on."

Authorities in London boosted the police presence by 40 percent and added extra surveillance as precautionary measures, but in the end all went peacefully.

Mark Cliggett, from Seattle, was back on the track Sunday after witnessing the attack in Boston. Cliggett, 51, said he was within 200 meters of the finishing line there when the bombs exploded.

"Last week was horrible, and people's lives have been changed in ways that can't be undone," he said after completing the London race. "I wanted to come out and just show: No, we're going to keep running, we're going to keep doing this."

Stuart Calderwood, an editor with a New York running magazine who has run in eight Boston Marathons, said that the recent carnage there made him and his friends more determined to run in London.

"My group that came here, we just decided this is going to make us better. We're going to say marathons are the opposite of bombing and hostility and terror," Calderwood, 55, said after finishing.

Londoners pride themselves on their resilience: A day after the lethal July 7, 2005, transit system bombings that killed 52 commuters, many came back onto the streets and resumed their normal routines.

Still, some acknowledged an undercurrent of anxiety Sunday. Chris Denton, a 44-year-old engineer, said he had asked that his family not come out to support him because of a possible copycat attack. "I left them at home," he said. "If only for my peace of mind."

A seemingly relaxed Prince Harry presented awards to the wheelchair racers and mingled with spectators.

"It's fantastic, typically British," he told the BBC. "People are saying they haven't seen crowds like this for eight years around the route. It's remarkable to see."

He said it was "never an option" for him to cancel his appearance following the Boston bombings.

"No one has changed any plans, volunteers, security, nothing has changed," he said. "Typically the British way."

On Blackheath, the spacious green common area where the race begins, runners massaged each other's legs as loud pop music boomed on a sound system. A half-dozen police officers in reflective vests mingled and chatted with the runners. Many in the crowd wore Boston T-shirts.

Moments before the majority of runners set off on the grinding course, announcer Geoff Wightman used the loudspeakers to ask for a moment of silence. He described marathon running as a global sport that unites runners and supporters in every continent in a spirit of friendship.

As those gathered responded to his call, the only noise that could be heard was the buzz of helicopters and the beeping of a truck.

Security was plentiful but not intrusive near the finish line at the Mall in front of Buckingham Palace. Marathon staff, officials and journalists had their bags checked, a process not deemed necessary at the event last year. Officials said this was in response to the Boston attack.

Marathon organizers plan to donate money to a Boston fund set up to help the bombing victims. They said they did not consider canceling the London event, which is a highlight of the sporting calendar.

In a smaller event in Germany, some 15,000 runners participated Sunday in the Hamburg Marathon. They wore armbands with the slogan "Run for Boston."

Extra security was added and there was no disruption. Hamburg organizers have said that they know of only eight people who pulled out because of the Boston bombings.

Meanwhile, thousands of New Yorkers donned "I Run for Boston" bibs during a 4-mile run Sunday in Central Park, one of a number of races held around the world in support of the victims of the marathon bombings.

"It was really quite a powerful morning," said Mary Wittenberg, CEO of the New York Road Runners. "We dedicated the race to Boston."

More than 6,000 runners took part in Sunday's City Parks Foundation Run for the Parks, which was planned before Monday's bombings.

Organizers turned it into a show of solidarity by selling "I Run for Boston" T-shirts with proceeds going to the One Fund Boston, the official fund for those affected by the bombing.

Other "Run for Boston" events have taken place around the U.S. and the world, with many runners wearing blue and yellow, the official Boston Marathon colors.

More than 500 runners gathered in St. Louis on Saturday for a Unity Run. In San Francisco, about 400 people ran four miles along the Embarcadero on Friday. A run christened "Boston Strong San Diego" is planned for Monday.

In Michigan, runners braved sub-freezing temperatures and a partly flooded course Sunday in the Lansing Marathon, which was dedicated to the Boston victims. In Burlington, Vt., a 5-kilometer walk-run on Saturday raised more than $10,000 for Massachusetts General Hospital's emergency fund and One Fund Boston.

AP writers Karen Matthews in New York, Rob Harris in London and Geir Moulson in Berlin contributed to this report, along with Bloomberg News.